This is the first part of a 50 slide Power Point presentation which covers the processes of cellular respiration. Both aerobic and anaerobic respiration are discussed in depth. The following topics are covered in the presentation: respiration, energy, chemical bonds, ATP, ADP, glycolysis, glucose, Krebs' cycle, NADH, FADH2, NADH+, pyruvic acid, electron acceptor, lactic acid fermentation, alcoholic fermentation, mitochondria, CO2, and the electron transport chain. Slides include those with animation, photographs, flow diagrams, and illustrations as well as factual information to introduce and review these important topics in a high school level biology class. Due to its large size this presentation was split into two parts in order to upload and download properly. Part II is available for download.